[Coco] Computerdoc - Coco Hardware Development Adapter

[Camillus Blockx]

do you have the pcb layout files?
Or a spare pcb?
Camillus
On 10/6/2014 12:22:41 PM, Kandur <k at qdv.pw> wrote:
Hi Kip,
Here is my blog's Super Board address:
http://qdv.pw/coco/?p=201
>From there you can download the device descriptors
and other source files, the parts list is there too.
Unfortunately I have no schematic for this board.
I was hoping that Kevin Diggs, having the same board, may have one.
So far using an ohm meter found out that the 1488 RS-232 driver's
-V pin is connected to the edge connector's #1 pin,
(-5V on Coco-1, N/C on Coco-3). In the Coco-3 I'd like to connnect the
junction of D3&D4 in the power supply, to the edge connector's pin 1,
via a resistor, to supply -5V to the Super Board.
I only have a Coco-3, any caveats about trying to do that?

BTW here is the board's memory map:
PIA equ $FF64 address of baud rate pia
PIA1 equ $FF60 address of 2nd rate port
PORT1 equ $FF68 address of acia #1
PORT2 equ $FF6C address of acia #2
PORT3 equ $FF78 address of acia #3
PORT4 equ $FF7C address of acia #4
CCPIA equ $FF22 address of coco firq pia
PIACR equ $FF23

One more finding, the two BR-2325 button cells are
connected parallel. These seem to power only the HD146818
Real Time Clock chip, does it need more then one BR-2325?

Kandur

Monday, October 6, 2014, 12:16:57 AM, you wrote:
> Hi Kandur!
> Thanks a bunch. I'll be waiting for your email.
> Could you resend a link to your blog? I can't find it in my email database
> as of yet. Thanks a bunch.
> Yes, I think I do remember seeing some 6850 driver descriptors in the list
> of your archive last time I read it. I want to look at them again. I would
> also like to see some schematics if available. I'm working on what will one
> day be my biggest project yet. I'm nowhere near ready to announce it yet.
> It's in the beginning stages of design at this point. I'd like to get a
> copy of that software so I can begin to collect the drivers and driver
> descriptors I will need. You can send it directly to my email address
> below. Thanks a bunch! Take care my friend.

> Kip Koon

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